Toyota Repair: 1997 toyota 4runner, toyota 4runner, wrech

Question
Replacing 02 sensor in front of converter. Can't seem to find a socket or wrech to fit the nuts and I don't want to strip it. Any ideas would be appreciated.

Answer
The sensors have two 12mm nuts attaching them, sometimes they rust and a wrench will not fir anymore, try using a vise grip or other type of adjustable plier but in most cases they will strip oput anyway and the studs have to be replaced or the exhaust pipe.